//#include <iostream>
//using namespace std;
//
//int main()
//{
//	int arr[168] = { 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997 };
//	int num = 0;
//	cin >> num;
//	int left = 0;
//	int right = 167;
//	int mid = (left + right) / 2;
//	while (left < right - 1)
//	{
//		if (arr[mid] > num / 2)
//		{
//			right = mid;
//			mid = (left + right) / 2;
//		}
//		else if (arr[mid] < num / 2)
//		{
//			left = mid;
//			mid = (left + right) / 2;
//		}
//		else if (arr[mid] == num / 2)
//		{
//			break;
//		}
//	}
//
//	int x = 0;
//	int y = 0;
//	for (int i = mid; i >= 0; --i)
//	{
//		x = arr[i];
//		for (int i = mid; i < 168; ++i)
//		{
//			y = arr[i];
//			if (x + y >= num)
//				break;
//		}
//		if (x + y == num)
//			break;
//	}
//	cout << x << endl;
//	cout << y << endl;
//
//	return 0;
//}